By merging its two publishing divisions, the company will increase their share of the country's $21 billion book market from 6 percent to 10 percent, a market ranging from obscure textbooks to mass-market paperbacks.

Atheir share of the country's $21 billion book market from 6 percent to 10 percent, a market ranging
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Bfrom 6 percent to 10 percent its share of the $21 billion book market in the country, which ranges
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Cto 10 percent from 6 percent in their share of the $21 billion book market in the country, a market ranging
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Din its share, from 6 percent to 10 percent, of the $21 billion book market in the country, which ranges
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Eto 10 percent from 6 percent its share of the country's $21 billion book market, which ranges
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